Added ability to rename files in-app.

Tap and hold on the cell for a ROM and it will allow you to rename the
file (and all files connected to that ROM).
Fixed downloading files without extensions.

File extensions will be properly appended to the filename when
downloaded.
Updated file renaming function to work better.

Now the function goes through every folder recursively to rename
everything.
Can now rename ROMs, option to auto save, and can now check for updates
Added ability to toggle on/off Check For Updates